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Designing a Lego orrery (marian42.de)

622 points by _Microft · 795 days ago · 65 comments on HN

Article summary

The article describes the design and construction of a custom Lego orrery, a mechanical model of the solar system, with a focus on accurately modeling the Earth's axial tilt and the Moon's orbital inclination. The author used a combination of physical prototyping and digital design tools to create the orrery, which features a complex system of gears and axles. The orrery is designed to demonstrate astrodynamic phenomena, such as the seasons and eclipses, and the author provides a detailed explanation of the design process and the mathematical calculations involved. The article also mentions the author's development of a gear ratio calculator tool to aid in the design of the orrery.

Main themes

  • Lego design
  • Mechanical modeling
  • Astrodynamics
  • Gear design
  • Mathematical calculations
  • DIY engineering

What commenters say

  • The Lego orrery is an impressive example of what can be achieved with creativity and perseverance, and its design and construction are a testament to the power of DIY engineering.
  • The official Lego orrery design is inferior to the custom design presented in the article, and the company should consider adopting the custom design for future releases.
  • The article's explanation of the Earth's axial tilt and its effect on the seasons is a valuable educational resource, and interactive models like the orrery can be an effective way to teach complex concepts.
  • The use of digital design tools and software can greatly aid in the design and construction of complex mechanical models like the orrery, but may not be suitable for all users.
  • The orrery's design and construction demonstrate the importance of understanding and applying mathematical concepts, such as gear ratios and angular momentum, in real-world engineering projects.
  • The article's discussion of the challenges and limitations of designing and building a complex mechanical model like the orrery highlights the value of perseverance and creative problem-solving in engineering and DIY projects.